Matt Rude

MDR Webmaster Tools provides many small necessary functions to WordPress when for managing your site with <a href="https://www.google.com/webmasters/tools/" rel="nofollow ugc">Google</a>, <a href="https://siteexplorer.search.yahoo.com" rel="nofollow ugc">Yahoo</a>, & <a href="http://www.bing.com/toolbox/webmaster" rel="nofollow ugc">Bing’s</a> webmaster tools sites. The plugin adds the following functions to WordPress
<ul>
<li>Dynamic Sitemap</li>
<li>Ability to modify your robots.txt file.</li>
<li>Site verification scripts for Google, Yahoo, & Bing.</li>
<li>Google Analytics Tracking Script for registered sites.</li>
</ul>
This plugin will create a sitemap for your WordPress site (http://example.com/sitemap.xml). No files are stored on your disk, the sitemap.xml file is generate as needed, like your feeds. No UI to speak of, just drop in place and your good to go.
This plugin is fully translatable with the full POT file included.
For Support, please contact me via the <a href="https://wordpress.org/tags/mdr-webmaster-tools?forum_id=10#postform" rel="ugc">WordPress Forums</a>, if you find a bug, please create a ticket on the plugins <a href="https://github.com/mattrude/wp-plugin-webmaster-tools/issues" rel="nofollow ugc">Github Issues</a> page.
See Tools -> Webmaster Tools

MDR Webmaster Tools

Provides Webmaster site verification scripts for Google, Yahoo, & Bing. Plugin also provides Google Analytics Tracking Script and sitemap support.

Eugen Bobrowski

Plugin provide to help search engines to indexing site correctly.
A simple plugin to manage your robots.txt. Plugin donn’t create the file or edit it. This plugin edit WordPress output of robots.txt content. And get you a easy and usable interface to manage it.
Features
<ul>
<li>Drag-n-drop robots.txt paths</li>
<li>Changing <code>blog_public</code> option form plugin settings page</li>
<li>Site map field for robots.txt</li>
<li>Robots.txt physical file checking.</li>
</ul>

Robots.txt rewrite

first review

Provide the easy managment of your robots.txt from admin side. It propose you the advanced then standard robots.txt content too.

MDR Webmaster Tools vs Robots.txt rewrite